The Portland Design Works Daybot Tail Light has a CREE LED to power a 100 lumen Daytime Pulse mode for increased visibility on sunny days. Switch from Day Modes to Night Modes to conserve battery power. Hold the power button down for 1 second to turn the light on or off. The Daybot Tail Light has redesigned mount that works with the included seatpost and seatstay brackets. - 2 Day Modes (runtime): Solid - 60 lumens (6 hours), Pulse - 100 lumens (20 hours) - 3 Night Modes (runtime): Solid - 20 lumens (20 hours), Flash - 20 lumens (100 hours), Pulse - 20 lumens (30 hours) - USB rechargeable li-polymer battery - Weatherproof exterior for all season riding - Includes brackets for seatpost and seatstay mounting - Mounts vertically or horizontally - Includes Micro USB recharging cord - Weight: 1.9 oz - Lifetime Warranty